Gas mask



FIG. 1 is a front elevational view of a gas mask showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a sectional view thereof taken along the line VII--VII of FIG. 1; and

FIG. 8 is a top and front perspective view thereof. 

The ornamental design for a gas mask, as described and shown. 